Used for specific properties like
-elasticity, then comfort close to the back
-transparency, to clearly see the water level inside
-resistance to any liquid, then taste free
-PVC free, then no toxic substances reject when recycled
Thermoplastic polyurethanes are perfect for bladder and tube.

Blaster valve

Blaster valve-

A new engineered valve that blast water for quick and non-fatigue hydration.
Higher flow, softer feeling in mouth, no leaking.